Ball pin



FIG. 1 is a perspective view of a ball pin according to my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions of the drawings appearing in broken lines show portions of a ball pin that forms no part of the claimed. 

CLAIM The ornamental design for a ball pin, as shown and described. 